Remove the legacy, locally-bundled tzdata payload and re-implement CPTimeZone to wrap the host JavaScript engine's native timezone capabilities.
This uses fundamental properties of the host Javascript environment and is supported by browsers and Node.
* Transition offset calculations, abbreviation lookups, and DST evaluations to rely on native temporal data via underlying bridging functions (e.g., `_offsetMinutesForZone`, `_abbreviationForNameAndDate`).
* Implement synthetic fallback logic for fixed-offset abbreviations when native engines fail to produce IANA short names.
* Route localized timezone name resolution (`_localizedNameForZone`) through native formatters.
* Establish deterministic temporal baseline required by CPDateFormatter test suites.
Eliminates the maintenance burden of updating a bundled tzdata package and guarantees timezone resolution remains synchronized with the host environment.
David Richardson
a808c6fbab